On Feb. 24, Ukrainian authorities made an alarming discovery: bones and other human tissues crammed into coolers in a grimy white minibus.

Investigators grew even more intrigued when they found, amid the body parts, envelopes stuffed with cash and autopsy results written in English.

What the security service had disrupted was not the work of a serial killer but part of an international pipeline of ingredients for medical and dental products that are routinely implanted into people around the world.

The seized documents suggested that the remains of dead Ukrainians were destined for a factory in Germany belonging to the subsidiary of a U.S. medical products company, Florida-based RTI Biologics.

RTI is one of a growing industry of companies that make profits by turning mortal remains into everything from dental implants to bladder slings to wrinkle cures.

The industry has flourished even as its practices have roused concerns about how tissues are obtained and how well grieving families and transplant patients are informed about the realities and risks of the business.

In the U.S. alone, the biggest market and the biggest supplier, an estimated two million products derived from human tissue are sold each year, a figure that has doubled over the past decade.

It is an industry that promotes treatments and products that literally allow the blind to see (through cornea transplants) and the lame to walk (by recycling tendons and ligaments for use in knee repairs). It's also an industry fueled by powerful appetites for bottom-line profits and fresh human bodies.

In the Ukraine, for example, the security service believes that bodies passing through a morgue in the Nikolaev district, the gritty shipbuilding region located near the Black Sea, may have been feeding the trade, leaving behind what investigators described as potentially dozens of “human sock puppets” — corpses stripped of their reusable parts.

Industry officials argue that such alleged abuses are rare, and that the industry operates safely and responsibly.

For its part, RTI didn’t respond to repeated requests for comment or to a detailed list of questions provided a month before this publication.

In public statements the company says it “honors the gift of tissue donation by treating the tissue with respect, by finding new ways to use the tissue to help patients and by helping as many patients as possible from each donation.”